JP7802168B2 - Electrochemical and electrical equipment - Google Patents

Description

This disclosure relates to the field of energy storage technology, and in particular to electrochemical devices and electrical equipment.

Button batteries are widely used in Bluetooth earphones, but the noise floor caused by their self-magnetic field affects the sound quality of Bluetooth earphones and the user experience.

In light of this situation, it is necessary to provide an electrochemical device that reduces electromagnetic interference with electrical equipment.

A first aspect of the present invention provides an electrochemical device including a case and an electrode assembly housed within the case. The case includes a top wall on which a first electrode is provided, a side wall, and a bottom wall. The electrode assembly includes a first pole piece and a second pole piece. The electrochemical device satisfies at least one of the following conditions (i) to (ii).

Condition (i)
The electrochemical device further includes a first tab and a first connector provided outside the case. The first tab connects the first pole piece and the first electrode, and the first tab has a first connection area connected to the first pole piece. The first connector is connected to the first electrode. When viewed from a direction perpendicular to the top wall, a line connecting the geometric center of the first connection area and the geometric center of the first electrode is a first reference line. The first region is a sectorial region of ±45° on both sides of the first reference line, with the geometric center of the first electrode as its center and the length L1 of the line segment between the geometric center of the first connection area and the geometric center of the first electrode as its radius. When the area of the first connector is S1 and the area of the overlapping portion of the first connector and the first region is S2, the relationship S2/S1 ≧ 50% is satisfied.

Condition (ii)
The electrochemical device further includes a second tab and a second connector provided outside the case. The second tab connects the second pole piece to the case, and the second tab includes a second connection region connected to the second pole piece and a third connection region connected to the case. The second connector is connected to the case. When viewed from a direction perpendicular to the bottom wall, a line connecting the geometric center of the second connection region to the geometric center of the third connection region is a second reference line. The second region is a sectorial region extending ±45° on both sides of the second reference line, with the geometric center of the third connection region as its center and the length L2 of the line segment between the geometric centers of the second connection region and the third connection region as its radius. When the area of the second connector is S3 and the area of the overlapping portion of the second connector and the second region is S4, the relationship S4/S3 ≥ 50% is satisfied.

When the electrochemical device is in a charging/discharging state, the magnetic field generated from the first tab and the magnetic field generated from the first connector are at least partially canceled out, and/or the magnetic field generated from the second tab and the magnetic field generated from the second connector are at least partially canceled out, resulting in a weaker magnetic field from the end face of the electrochemical device. Compared to other values of S2/S1 and/or S4/S3, when S2/S1 ≥ 50% and/or S4/S3 ≥ 50%, the magnetic field from the end face of the electrochemical device is weaker, resulting in less electromagnetic interference with electrical equipment.

In some embodiments of the present disclosure, the electrochemical device further satisfies at least one of the following conditions (iii) to (iv):

Condition (iii) is that S2/S1 ≥ 70% is satisfied.

Condition (iv) is that S4/S3≧70% is satisfied.

When S2/S1≧70% and/or S4/S3≧70%, the magnetic field generated at the end surface of the electrochemical device is small, and the difference in magnetic field strength at the end surface is small.

In some embodiments of the present disclosure, the electrochemical device further satisfies at least one of the following conditions (v) to (vi):

Condition (v)
The first connector has a fourth connection region at an end thereof remote from the first electrode, and when viewed from a direction perpendicular to the top wall, an angle θ formed between a line connecting the geometric center of the fourth connection region to the geometric center of the first electrode and a line connecting the geometric center of the first connection region to the geometric center of the first electrode satisfies 0°≦θ≦45°.

Condition (vi)
The second connector has a fifth connection region at an end thereof remote from the third connection region. When viewed from a direction perpendicular to the bottom wall, an angle β formed by a line connecting the geometric center of the fifth connection region to the geometric center of the third connection region and a line connecting the geometric center of the second connection region to the geometric center of the third connection region satisfies 0°≦β≦45°.

When θ≦45°, compared to when θ>45°, the magnetic field generated by the first tab and the magnetic field generated by the first connector cancel each other out more effectively, resulting in better electromagnetic characteristics for the electrochemical device. When β≦45°, compared to when β>45°, the magnetic field generated by the second tab and the magnetic field generated by the second connector cancel each other out more effectively, resulting in better electromagnetic characteristics for the electrochemical device.

In some embodiments of the present disclosure, the first connector has a fourth connection region at an end far from the first electrode. When viewed perpendicular to the top wall, the line connecting the geometric center of the fourth connection region and the geometric center of the first electrode is the third reference line. The third region is a sectorial region of ±45° on both sides of the third reference line, with the geometric center of the first electrode as its center and the length L3 of the line segment between the geometric center of the fourth connection region and the geometric center of the first electrode as its radius. If the area of the overlap between the second connector and the third region is S5, then S5/S3 ≥ 50% is satisfied. When the electrochemical device is in a charging/discharging state, the magnetic field generated by the first connector and the magnetic field generated by the second connector at least partially cancel each other out, thereby weakening the magnetic field generated by the entire electrochemical device. Compared to when S5/S3<50%, when S5/S3≧50%, the magnetic fields generated by the first connector and the second connector cancel each other out more effectively, resulting in better electromagnetic characteristics for the electrochemical device.

In some embodiments of the present disclosure, the ratio of area S5 to area S3 satisfies S5/S3 ≧ 85%. When S5/S3 ≧ 85%, the magnetic fields generated by the first connector and the second connector cancel each other out more effectively, and the difference in magnetic field strength at the end surfaces is small.

In some embodiments of the present disclosure, when viewed from a direction perpendicular to the top wall, the angle α formed between the first reference line and the second reference line satisfies 0°≦α≦60°. Compared to α>60°, when 0°≦α≦60°, the magnetic fields generated by the first tab and the second tab cancel each other out more effectively, and the magnetic field generated by the entire electrochemical device is smaller.

In some embodiments of the present application, the electrode assembly has a wound structure. The first pole piece includes a first active material layer having a first end, the first end being located at the winding start end of the wound structure. The second pole piece includes a second active material layer having a second end, the second end being located at the winding start end of the wound structure. Let D1 be the distance between the geometric center of the first connection region and the first end along the longitudinal direction of the first pole piece, and D2 be the distance between the geometric center of the second connection region and the second end along the longitudinal direction of the second pole piece. When D1/D2 is 0.5≦D1/D2≦2, the magnetic fields generated by the first pole piece and the second pole piece cancel each other out more effectively than when D1/D2 is other values, and the magnetic fields generated by the electrochemical device have less of an impact on the electrical equipment. Furthermore, when 0.9≦D1/D2≦1.1, the magnetic fields generated by the first pole piece and the second pole piece cancel each other out more effectively, and the difference in magnetic field strength at the end face of the electrochemical device is small.

In some embodiments of the present disclosure, the electrochemical device further satisfies at least one of the following conditions (a) or (b):

Condition (a)
The first connector has a fourth connection region at an end thereof remote from the first electrode. When viewed from a direction perpendicular to the top wall, the length of the line segment between the geometric center of the fourth connection region and the geometric center of the first electrode is L3, and the relationship 0.5≦L1/L3≦2 is satisfied.

Condition (b)
The second connector has a fifth connection region at an end thereof remote from the third connection region. When viewed from a direction perpendicular to the bottom wall, the length of the line segment between the geometric center of the fifth connection region and the geometric center of the third connection region is L4, and the relationship 0.5≦L2/L4≦2 is satisfied.

Compared to other values of L1/L3, when 0.5≦L1/L3≦2, the magnetic field generated by the first tab and the magnetic field generated by the first connector cancel each other out more effectively, and the difference in magnetic field strength at various locations on the top wall of the electrochemical device is small. Compared to other values of L2/L4, when 0.5≦L2/L4≦2, the magnetic field generated by the second tab and the magnetic field generated by the second connector cancel each other out more effectively, and the difference in magnetic field strength at various locations on the bottom wall of the electrochemical device is small.

In some embodiments of the present disclosure, the electrochemical device further satisfies at least one of the following conditions (1) to (4): (1) The first tab and the second tab are located on opposite sides of the electrode assembly. (2) The top wall has opposing first and second surfaces, and a through-hole penetrating the first and second surfaces is provided, and the first electrode is provided in the through-hole. (3) An insulating material is provided between the top wall and the first electrode. (4) The case includes a metal material.

A second aspect of the present invention provides an electrical device including an electrochemical device according to any of the above embodiments. The electrochemical device weakens the magnetic field it generates, has good electromagnetic properties, and can reduce the impact of its own magnetic field on the electrical device.

FIG. 1 is a first three-dimensional view illustrating an electrochemical device according to an embodiment of the present disclosure. FIG. 2 is a second three-dimensional view showing an electrochemical device according to an embodiment of the present disclosure. 1 is a partial cross-sectional view illustrating an electrochemical device according to an embodiment of the present disclosure. FIG. 2 is a diagram illustrating a configuration of a first electrode according to an embodiment of the present disclosure. FIG. 2 is a first three-dimensional view illustrating an electrode assembly, a first tab, and a second tab according to an embodiment of the present disclosure. FIG. 2 is a second three-dimensional view showing an electrode assembly, a first tab, and a second tab according to an embodiment of the present disclosure. FIG. 2 is a third plan view illustrating an electrochemical device according to an embodiment of the present disclosure. FIG. 10 is a third plan view showing an electrode assembly, a first tab, and a second tab according to an embodiment of the present disclosure. FIG. 10 is a fourth plan view showing an electrochemical device according to another embodiment of the present disclosure. FIG. 5 is a fifth plan view illustrating an electrochemical device according to an embodiment of the present disclosure. FIG. 6 is a sixth plan view showing an electrochemical device according to an embodiment of the present disclosure. 1 is a diagram illustrating a configuration of an electrical device according to an embodiment of the present disclosure.

The present disclosure is further explained in the following detailed description in conjunction with the above-mentioned drawings.
The invention relating to the embodiments of the present application will be described below with reference to the drawings of the embodiments of the present application. However, it should be understood that the described embodiments are only a part of the embodiments of the present application and are not limited to all the embodiments.

Note that when an element is considered to be "connected" to another element, it may be directly connected to the other element, or it may be connected to the other element through another element. When an element is described as being "provided on" another element, it may be directly connected to the other element, or it may be connected to the other element through another element.

Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. The terminology used herein is for the purpose of describing specific examples only and is not intended to be limiting of the present application.

A first aspect of the present invention provides an electrochemical device including a case and an electrode assembly housed within the case. The case includes a top wall on which a first electrode is provided, a side wall, and a bottom wall. The electrode assembly includes a first pole piece and a second pole piece. The electrochemical device satisfies at least one of the following conditions (i) to (ii).

Condition (i)
The electrochemical device further includes a first tab and a first connector provided outside the case. The first tab connects the first pole piece and the first electrode, and the first tab has a first connection area connected to the first pole piece. The first connector is connected to the first electrode. When viewed from a direction perpendicular to the top wall, a line connecting the geometric center of the first connection area and the geometric center of the first electrode is a first reference line. The first region is a sectorial region of ±45° on both sides of the first reference line, with the geometric center of the first electrode as its center and the length L1 of the line segment between the geometric center of the first connection area and the geometric center of the first electrode as its radius. When the area of the first connector is S1 and the area of the overlapping portion of the first connector and the first region is S2, the relationship S2/S1 ≧ 50% is satisfied.

Condition (ii)
The electrochemical device further includes a second tab and a second connector provided outside the case. The second tab connects the second pole piece to the case, and the second tab includes a second connection region connected to the second pole piece and a third connection region connected to the case. The second connector is connected to the case. When viewed from a direction perpendicular to the bottom wall, a line connecting the geometric center of the second connection region to the geometric center of the third connection region is a second reference line. The second region is a sectorial region extending ±45° on both sides of the second reference line, with the geometric center of the third connection region as its center and the length L2 of the line segment between the geometric centers of the second connection region and the third connection region as its radius. When the area of the second connector is S3 and the area of the overlapping portion of the second connector and the second region is S4, the relationship S4/S3 ≥ 50% is satisfied.

When the electrochemical device is in a charging/discharging state, the magnetic field generated from the first tab and the magnetic field generated from the first connector are at least partially canceled out, and/or the magnetic field generated from the second tab and the magnetic field generated from the second connector are at least partially canceled out, resulting in a weaker magnetic field from the end face of the electrochemical device. Compared to other values of S2/S1 and/or S4/S3, when S2/S1 ≥ 50% and/or S4/S3 ≥ 50%, the magnetic field from the end face of the electrochemical device is weaker, resulting in less electromagnetic interference with electrical equipment.

As an example, the electrochemical device will be further described using an example where the device is mounted on a horizontal surface with the bottom wall at the bottom and the top wall at the top.

Embodiments of the present disclosure are further described below with reference to the drawings.

As shown in Figures 1, 2, and 3, an embodiment of the present disclosure provides an electrochemical device 100 including a case 1, an electrode assembly 2, a first tab 3, a second tab 4, a first connector 5, and a second connector 6. The electrode assembly 2, the first tab 3, and the second tab 4 are provided inside the case 1, and the electrode assembly 2 connects the first tab 3 and the second tab 4. The first connector 5 and the second connector 6 are provided outside the case 1, and the first connector 5 and the first tab 3 are electrically connected, and the second connector 6 and the second tab 4 are electrically connected. The first connector 5 and the second connector 6 are for connecting to an electrical device, and the electrochemical device 100 can supply power to the electrical device.

The case 1 has a top wall 11, side walls 12, and bottom wall 13, which together form a surrounding storage space 14, within which the electrode assembly 2, first tab 3, and second tab 4 are located.

A first electrode 111 is provided on the top wall 11, connecting the first tab 3 and the first connector 5.

In one embodiment, the top wall 11 has a first surface 112 and a second surface 113 that are spaced apart and have a through hole 114 formed therein. The through hole 114 passes through the first surface 112 and the second surface 113, with the first surface being located on one side of the top wall 11 facing the storage space 14 and the second surface 113 being located on one side of the top wall 11 that is spaced apart from the storage space 14.

At least a portion of the first electrode 111 is disposed within the through-hole 114. In one embodiment, the electrochemical device 100 further includes an insulating material 7, which is disposed between the top wall 11 and the first electrode 111 and connects and insulates the top wall 11 from the first electrode 111, thereby reducing the risk of the electrochemical device 100 short-circuiting.

In one embodiment, the material of the first electrode 111 includes, but is not limited to, aluminum or copper metal.

In one embodiment, the bottom wall 13 connects the second tab 4 and the second connector 6 and includes a conductive portion 131 that electrically connects the second tab 4 and the second connector 6. In one embodiment, the conductive portion 131 includes a metal material.

In one embodiment, the first connector 5 includes a metal material. In one embodiment, the second connector 6 includes a metal material.

In another embodiment, the first electrode 111 may be provided within the through hole 114 (not shown), and the insulating material 7 may be provided between the first electrode 111 and the inner wall of the through hole 114.

As shown in Figures 3 and 4, the first electrode 111 includes a first portion 1111 and a second portion 1112. The first portion 1111 has a third surface 1111a, and the second portion 1112 protrudes beyond the third surface 1111a. The first portion 1111 is provided within the storage space 14, and the second portion 1112 is located within the through-hole 114.

For ease of understanding and description, the direction perpendicular to the top wall 11 will be referred to as the third direction Z, and the longitudinal direction of the first connector 5 as viewed along the third direction Z will be referred to as the first direction X, and the longitudinal direction of the second connector 6 as the second direction Y.

In one embodiment, the insulating material 7 has a ring structure, and the second portion 1112 of the first electrode 111 passes through the ring structure.

In one embodiment, the insulating material 7 is made of a sealant material, but is not limited to this.

As shown in Figures 5 and 6, the electrode assembly 2 includes a first pole piece 21, a second pole piece 22, and a separator membrane 23 disposed between the first pole piece 21 and the second pole piece 22. In one embodiment, the first pole piece 21, the separator membrane 23, and the second pole piece 22 are wound.

One of the first pole piece 21 and the second pole piece 22 is a positive pole piece and the other is a negative pole piece.

One of the first tab 3 and the second tab 4 is a positive tab, and the other is a negative tab.

The first pole piece 21 includes a first active material layer 211, and the first tab 3 has a first connection region 31, and the first tab 3 is connected to the first pole piece 21 at the first connection region 31.

The second pole piece 22 includes a second active material layer 221, and the second tab 4 has a second connection region 41, and the second tab 4 is connected to the second pole piece 22 at the second connection region 41.

In one embodiment, the first tab 3 is located on one side of the electrode assembly 2, and the second tab 4 is located on the opposite side of the electrode assembly 2. In another embodiment, the first tab 3 and the second tab 4 may be located on the same side of the electrode assembly 2 (not shown).

The electrode assembly 2 has a wound structure. In one embodiment, the first active material layer 211 includes a first end 2111 provided at the winding start end of the wound structure, and the second active material layer 221 includes a second end 2211 provided at the winding start end of the wound structure.

D1 is the distance along the longitudinal direction of the first pole piece 21 between the geometric center of the first connection region 31 and the first end 2111. D2 is the distance along the longitudinal direction of the second pole piece 22 between the geometric center of the second connection region 41 and the second end 2211. Preferably, 0.5≦D1/D2≦2.

When the electrochemical device 100 is in a charging/discharging state, the direction of the current between the first end 2111 and the first connection region 31 is opposite to the direction of the current between the second end 2211 and the second connection region 41, and the magnetic fields generated by the reverse currents in the first pole piece 21 and the second pole piece 22 can be at least partially canceled out, reducing the impact of the magnetic field generated by the electrochemical device 100 on the electrical equipment.

More preferably, 0.9≦D1/D2≦1.1. When 0.9≦D1/D2≦1.1, the magnetic fields generated by the first pole piece 21 and the second pole piece 22 cancel each other out more effectively, and the difference in magnetic field strength at various points on the end surface of the electrochemical device 100 is reduced.
1, 2 and 3, the second tab 4 further has a third connection region 42, and the second tab 4 is connected to the conductive portion 131 of the bottom wall 13 at the third connection region 42.

The first connector 5 has a fourth connection region 51 at the end remote from the first electrode 111, and the second connector 6 has a fifth connection region 61 at the end remote from the third connection region 42. The fourth connection region 51 and the fifth connection region 61 are connected to the electrical device, electrically connecting the electrochemical device 100 to the electrical device.

Referring to Figures 5, 6, and 7 together, when viewed along the third direction Z, the line connecting the geometric center of the fourth connection region 51 and the geometric center of the first electrode 111 is denoted by W1, the line connecting the geometric center of the first connection region 31 and the geometric center of the first electrode 111 is denoted by W2, and the angle formed between the line W1 and the line W2 is denoted by θ.

In this application, θ is the angle, viewed along the third direction Z, between a line having the geometric center of the first electrode 111 as its endpoint, passing through the geometric center of the fourth connection region 51, and a line passing through the geometric center of the first connection region 31.

In one embodiment, 0°≦θ≦45°. When the electrochemical device 100 is in a charging/discharging state, the direction of the current flowing through the first tab 3 and the first connector 5 tends to be reversed when viewed along the third direction Z, causing the magnetic field generated by the first tab 3 and the magnetic field generated by the first connector 5 to at least partially cancel each other out, weakening the magnetic field generated on the top wall 11 side of the electrochemical device 100 and reducing the impact of the magnetic field generated by the electrochemical device 100 on the electrical equipment. Compared to when θ>45°, when θ≦45°, the magnetic field generated by the first tab 3 and the magnetic field generated by the first connector 5 cancel each other out more effectively, resulting in better electromagnetic properties for the electrochemical device 100.

When viewed from the third direction Z, the line connecting the geometric center of the fifth connection region 61 and the geometric center of the third connection region 42 is defined as W3, the line connecting the geometric center of the second connection region 41 and the geometric center of the third connection region 42 is defined as W4, and the angle between line W3 and line W4 is defined as β.

In this application, β is the angle formed between a line passing through the geometric center of the fifth connection region 61 and a line passing through the geometric center of the second connection region 41, with the geometric center of the third connection region 42 as its endpoint, when viewed from the third direction Z.

In one embodiment, 0°≦β≦45°. When the electrochemical device 100 is in a charging/discharging state, the direction of the current flowing through the second tab 4 and the second connector 6 tends to be reversed when viewed along the third direction Z. This causes the magnetic field generated by the second tab 4 and the magnetic field generated by the second connector 6 to at least partially cancel each other out, weakening the magnetic field generated on the bottom wall 13 side of the electrochemical device 100 and reducing the impact of the magnetic field generated by the electrochemical device 100 on the electrical equipment. Compared to when β>45°, when β≦45°, the magnetic field and inductance generated by the second tab 4 and the magnetic field and inductance generated by the second connector 6 cancel each other out more effectively, resulting in better electromagnetic characteristics for the electrochemical device 100.

When viewed from the third direction Z, the length of the line segment between the geometric center of the first connection region 31 and the geometric center of the first electrode 111 is defined as L1, and the length of the line segment between the geometric center of the fourth connection region 51 and the geometric center of the first electrode 111 is defined as L3.

Preferably, 0.5≦L1/L3≦2. Compared to other values of L1/L3, when 0.5≦L1/L3≦2, the magnetic fields generated by the first tab 3 and the first connector 5 cancel each other out more effectively, and the magnetic field generated by the electrochemical device 100 has less of an effect on the electrical equipment. Preferably, 0.9≦L1/L3≦1.1.

When viewed from the third direction Z, the length of the line segment between the geometric center of the second connection region 41 and the geometric center of the third connection region 42 is defined as L2, and the length of the line segment between the geometric center of the fifth connection region 61 and the geometric center of the third connection region 42 is defined as L4.

In one embodiment, 0.5≦L2/L4≦2. Compared to other values of L2/L4, when 0.5≦L2/L4≦2, the magnetic fields generated by the second tab 4 and the second connector 6 cancel each other out more effectively, and the magnetic field generated by the electrochemical device 100 has less of an effect on the electrical equipment. Preferably, 0.9≦L2/L4≦1.1.

In one embodiment, the angle between line W2 and line W4 is preferably 0°≦α≦60°. When the electrochemical device 100 is in a charging/discharging state, the magnetic field generated by the first tab 3 and the magnetic field generated by the second tab 4 are at least partially canceled out, weakening the magnetic field generated by the entire electrochemical device 100 and reducing the impact of the magnetic field generated by the electrochemical device 100 on the electrical equipment. In this application, the included angle α is the included angle between the line from the intersection of line W2 and line W4, or an extension of both, to the geometric center of the first connection region 31 and the line from this intersection to the geometric center of the second connection region 41.

As shown in Figures 8 and 9, when viewed from the third direction Z, the line W2 is the first reference line, the center is the geometric center of the first electrode 111, the length L1 of the line segment is the radius, the sectorial region of ±45° on both sides of the first reference line is the first region A1, the area of the first connector 5 is S1, and the area of the overlapping portion between the first connector 5 and the first region A1 is S2.

Preferably, S2/S1 is greater than or equal to 50%. Compared to when S2/S1 is less than 50%, when S2/S1 is greater than or equal to 50%, the magnetic fields generated by the first tab 3 and the first connector 5 cancel each other out more effectively, and the magnetic field generated on the top wall 11 side of the electrochemical device 100 has less of an effect on the electrical equipment.

Preferably, S2/S1 is 70% or greater. When S2/S1 is 70% or greater, the magnetic fields generated by the first tab 3 and the first connector 5 cancel each other out more effectively, and the difference in magnetic field at various locations on the top wall 11 side is small.

In one embodiment, when viewed from the third direction Z, if the line W4 is the second reference line, the center is the geometric center of the third connection region 42, and the length of the line segment L2 is the radius, the sectorial region extending ±45° on both sides of the second reference line becomes the second region A2, the area of the second connector 6 is S3, and the area of the overlapping portion between the second connector 6 and the second region A2 is S4.

Preferably, S4/S3 ≧ 50%. Compared to when S4/S3 < 50%, when S4/S3 ≧ 50%, the magnetic fields generated by the second tab 4 and the second connector 6 cancel each other out more effectively, and the magnetic field generated on the bottom wall 13 side of the electrochemical device 100 has less of an effect on the electrical equipment.

Furthermore, S4/S3 ≧ 70%. When S4/S3 ≧ 70%, the magnetic fields generated by the second tab 4 and the second connector 6 cancel each other out more effectively, and the difference in magnetic field at various locations on the bottom wall 13 side is small.

As shown in Figures 10 and 11, in one embodiment, when viewed from the third direction Z, if the line W1 is the third reference line, the center is the geometric center of the first electrode 111, and the length of the line segment L3 is the radius, the sectorial region of ±45° on both sides of the third reference line becomes the third region A3, and the area of the overlapping portion between the second connector 6 and the third region A3 is S5.

In one embodiment, S5/S3 is greater than or equal to 50%. When the electrochemical device 100 is in a charging/discharging state, the magnetic field generated by the first connector 5 and the magnetic field generated by the second connector 6 at least partially cancel each other out, weakening the magnetic field generated by the entire electrochemical device 100 and reducing the impact of the magnetic field generated by the electrochemical device 100 on the electrical equipment.

Preferably, S5/S3 ≧ 85%. When S5/S3 ≧ 85%, the magnetic fields generated by the first connector 5 and the second connector 6 cancel each other out more effectively, and the difference in magnetic field at various locations on the top wall 11 side and bottom wall 13 side of the electrochemical device 100 is small.

To verify the effectiveness of the electrochemical device 100 of the present application in reducing the magnetic field generated, the following comparative tests were conducted.

Test-1:
The first tab is a positive tab, the second tab is a negative tab, the included angle β is 0°, the value of S4/S3 is 100%, the included angle α is 0°, the value of D1/D2 is 0.9418, and the magnitude of S2/S1 and the included angle θ is changed to record the magnetic flux density B on the top wall 11 side.

In this application, magnetic flux density is also referred to as magnetic induction strength and can represent the strength of the magnetic field. A larger magnetic flux density value indicates a stronger magnetic field, and a stronger magnetic field indicates a smaller reduction effect on the magnetic field generated by the electrochemical device 100. A smaller magnetic flux density value indicates a weaker magnetic field, and a weaker magnetic field indicates a greater reduction effect on the magnetic field generated by the electrochemical device 100.

As can be seen from Table 1, when S2/S1 is 100% and θ is 0°, the magnetic flux density B is approximately 4.56×10 ⁻⁶ T. When S2/S1 is 50% and θ is 47°, the magnetic flux density B is approximately 6.73×10 ⁻⁶ T (1.48 times that when 82/S1 is 100% and θ is 0°). When S2/S1 is 0% and θ is 70°, the magnetic flux density B is approximately 7.47×10 ⁻⁶ T (1.6 times that when S2/S1 is 1002/S1 is 100% and θ is 0°). When S2/S1 is 0% and θ is 180°, the magnetic flux density B is approximately 9.83×10 ⁻⁶ T (2.16 times that when 82/S1 is 100% and θ is 0°).

When S2/S1 is 100%, the projection of the first connector 5 and the projection of the first region A1 overlap when viewed from the third direction Z, and the electromagnetic characteristics of the electrochemical device 100 are excellent. As the value of the included angle θ decreases, the electromagnetic characteristics of the electrochemical device 100 are gradually optimized.

Test-2:
The first tab is a positive tab, the second tab is a negative tab, the included angle is θ0°, the value of S2/S1 is 100%, the included angle β is 0°, and the magnitudes of S5/S3, the included angle α and D1/D2 are changed, and the magnetic flux density B1 on the top wall 11 side and the magnetic flux density B2 on the bottom wall 13 side are recorded.

As can be seen from Table 2, when S5/S3 is 100% and α is 0°, the magnetic flux density B1 is approximately 4.560×10 ⁻⁶ T and the magnetic flux density B2 is approximately 3.390×10 ⁻⁶ T. When S5/S3 is 55% and α is 45°, the magnetic flux density B1 is approximately 5.265×10 ⁻⁶ T (approximately 1.15 times when S5/S3 is 100% and α is 0°) and the magnetic flux density B2 is approximately 4.115×10 ⁻⁶ T (approximately 1.21 times when S5/S3 is 100% and α is 0°). When S5/S3 is 0% and α is 90°, the magnetic flux density B1 is approximately 5.940×10 ⁻⁶ T (1.30 times when S5/S3 is 100% and α is 0°), and the magnetic flux density B2 is approximately 4.850×10 ⁻⁶ T (1.43 times when S5/S3 is 100% and α is 0°).

When S2/S1 is 100%, the projection of the second connector 6 and the projection of the first region A3 overlap when viewed from the third direction Z, and the electromagnetic characteristics of the electrochemical device 100 are excellent. As the α value decreases, the electromagnetic characteristics of the electrochemical device 100 are gradually optimized, and the magnetic flux density on the top wall 11 side and bottom wall 13 side of the electrochemical device 100 decreases even more significantly.

As shown in FIG. 12, an embodiment of the present application further provides an electrical device 200 comprising an electrical device main body 210 and an electrochemical device 100 according to any of the above-described embodiments, with the electrochemical device 100 being mounted on the electrical device main body 210. The electrochemical device 100 weakens the magnetic field it generates, has good electromagnetic properties, and can reduce the impact of its own magnetic field on the electrical device.

In addition, those skilled in the art may make other modifications within the spirit of this application, and naturally, modifications based on the spirit of this application are included in the scope disclosed in this application.

100 Electrochemical device
1 case
11 Ceiling wall
111 First electrode
1111 Part 1
1111a Third surface
1112 Second part
112 First surface
113 Second surface
114 through hole
12 Side wall
13 Bottom wall
131 Conductive part
14. Storage space
2 Electrode assembly
21 first pole piece
211 First active material layer
2111 First end
22 second pole piece
221 Second active material layer
2211 Second end
23 Separation membrane
3. First tab
31 First connection region
4. Second tab
41 Second connection region
42 third connection region
5. First Connector
51 Fourth connection region
6 Second Connector
61 Fifth connection region
7. Insulation materials
W1: A line connecting the geometric center of the fourth connection region and the geometric center of the first electrode
W2: A line connecting the geometric center of the first connection region and the geometric center of the first electrode
W3: A line connecting the geometric center of the fifth connection region and the geometric center of the third connection region
W4: Line connecting the geometric center of the second connection region and the geometric center of the third connection region L1: Length of the line segment connecting the geometric center of the first connection region and the geometric center of the first electrode
L2: The length of the line segment between the geometric center of the second connection region and the geometric center of the third connection region
L3: Length of the line segment between the geometric center of the fourth connection region and the geometric center of the first electrode
L4: The length of the line segment between the geometric center of the fifth connection region and the geometric center of the third connection region
A1 1st area
A2 Second area
A3 Third area
200 Electrical Equipment
210 Device body
X 1st direction
Y Second direction
Z 3rd direction

Claims (9)

1. An electrochemical device comprising:
a case including a top wall on which a first electrode is provided, a side wall, and a bottom wall;
an electrode assembly housed in the case and including a first pole piece and a second pole piece;
At least one of the following conditions (i) to (ii) is satisfied:
Condition (i) is
The electrochemical device comprises:
a first tab connecting the first pole piece and the first electrode and having a first connection region connecting to the first pole piece;
a first connector provided outside the case and connected to the first electrode,
When viewed from a direction perpendicular to the top wall, a line connecting the geometric center of the first connection region and the geometric center of the first electrode is defined as a first reference line, a sectorial region of ±45° on both sides of the first reference line is defined as a first region, the sectorial region is centered at the geometric center of the first electrode, and the length L1 of the line segment between the geometric center of the first connection region and the geometric center of the first electrode is defined as a radius, an area of the first connector is defined as S1, and an area of an overlapping portion of the first connector and the first region is defined as S2, where S2/S1≧50% is satisfied,
Condition (ii) is
The electrochemical device comprises:
a second tab connecting the second pole piece and the case, the second tab including a second connection region connected to the second pole piece and a third connection region connected to the case;
a second connector provided outside the case and connected to the case,
an electrochemical device characterized in that, when viewed from a direction perpendicular to the bottom wall, a line connecting the geometric center of the second connection region and the geometric center of the third connection region is defined as a second reference line, a second region is defined as a sectorial region of ±45° on both sides of the second reference line, with the geometric center of the third connection region as its center and the length L2 of the line segment between the geometric center of the second connection region and the geometric center of the third connection region as its radius, an area of the second connector is defined as S3, and an area of an overlapping portion of the second connector and the second region is defined as S4, wherein S4/S3≧50% is satisfied. At least one of the following conditions (iii) to (iv) is satisfied:
The condition (iii) is that S2/S1 ≧ 70% is satisfied.
2. The electrochemical device according to claim 1, wherein the condition (iv) is that S4/S3 ≥ 70% is satisfied. At least one of the following conditions (v) to (vi) is satisfied:
Condition (v) is
a fourth connection region is provided at an end of the first connector that is remote from the first electrode;
When viewed from a direction perpendicular to the top wall, an angle formed by a line connecting the geometric center of the fourth connection region and the geometric center of the first electrode and a line connecting the geometric center of the first connection region and the geometric center of the first electrode is defined as θ, and 0°≦θ≦45° is satisfied;
Condition (vi) is
a fifth connection region is provided at an end of the second connector that is distant from the third connection region;
2. The electrochemical device according to claim 1, wherein, when viewed from a direction perpendicular to the bottom wall, an angle formed by a line connecting the geometric center of the fifth connection region and the geometric center of the third connection region and a line connecting the geometric center of the second connection region and the geometric center of the third connection region is β, the angle satisfies 0°≦β≦45°. the first connector has a fourth connection region at an end remote from the first electrode;
2. The electrochemical device according to claim 1, wherein, when viewed from a direction perpendicular to the top wall, a line connecting the geometric center of the fourth connection region and the geometric center of the first electrode is defined as a third reference line, a sectorial region of ±45° on both sides of the third reference line is defined as a third region having a center at the geometric center of the first electrode and a length L3 of a line segment between the geometric center of the fourth connection region and the geometric center of the first electrode as a radius, and an area of overlap between the second connector and the third region is defined as S5, wherein S5/S3≧50% is satisfied. The electrochemical device described in claim 4, characterized in that the ratio of the area S5 to the area S3 satisfies S5/S3≧85%. The electrochemical device of claim 4, wherein when viewed from a direction perpendicular to the top wall, the angle between the first reference line and the second reference line is α, and the angle satisfies 0°≦α≦60°. At least one of the following conditions (a) to (b) is satisfied:
Condition (a) is
a fourth connection region is provided at an end of the first connector that is remote from the first electrode;
When viewed from a direction perpendicular to the top wall, a length of a line segment between the geometric center of the fourth connection region and the geometric center of the first electrode is defined as L3, and 0.5≦L1/L3≦2 is satisfied;
Condition (b) is
a fifth connection region is provided at an end of the second connector that is distant from the third connection region;
2. The electrochemical device according to claim 1, wherein, when viewed from a direction perpendicular to the bottom wall, the length of a line segment between the geometric center of the fifth connection region and the geometric center of the third connection region is L4, 0.5≦L2/L4≦2 is satisfied. At least one of the following conditions (1) to (4) is satisfied:
Condition (1) is that the first tab and the second tab are located on opposite sides of the electrode assembly;
Condition (2) is that the top wall has a first surface and a second surface facing each other, a through hole penetrating the first surface and the second surface is provided, and the first electrode is provided in the through hole;
Condition (3) is that an insulating material is provided between the top wall and the first electrode;
2. The electrochemical device according to claim 1, wherein the condition (4) is that the case contains a metal material. An electrical device comprising the electrochemical device according to any one of claims 1 to 8 .